Magnetic Chains Created by Polymer-Induced Assembly of Hollow Cobalt Nanoparticles

Details Magnetic Chains Created by Polymer-Induced Assembly of Hollow Cobalt Nanoparticles Magnetic Chains Created by Polymer-Induced Assembly of Hollow Cobalt Nanoparticles

2005-09-09

arxiv.org/abs/cond-mat/0509237v1

Physics

Condensed Matter

Materials Science

14 pages, 6 figures

Scientific paper

Magnetic chains of hollow cobalt nanoparticles (450-750 nm) have been synthesized by using poly(vinyl pyrrolidone) (PVP) as a template in an ethylene glycol solution. In this process, CoCl2.6H2O was reduced by N2H4.H2O in the presence of PVP. All of the Co nanoparticles are hollow with a shell of 40 nm and self-assembled into a chainlike structure that is as long as ~10 micron. At 300 K, the branched hollow Co nanoparticle chains exhibit a saturation magnetization of 37.5 emu/g, a remnant magnetization of approximately 1.55 emu/g, and a coercivity of about 66 Oe, which is more than an order of magnitude larger than that of the bulk

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